Valve lifter



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Patented June 16, 1925.

UNITED STATES PATENT orifice.

ANDREW A. KERCI-I, F CHICAGO, ILLINOIS.

VALVE LIFTER.

Applcationlerl June 11, `1921. VSerial No. 476,685.

springs of internal combustion motors in` order to facilitate thevremoval of the valve `parts and other workin connection therewith.

Valve lifters in general are tools having two forked arms `adapted toengage between `for spreading the arms apart to compress the spring(altho such tools maybe also operated by engaging the ends ofthe`springs and drawing 'the arms together).

'llhe object of the present invention -is to provide an improvedconstruction fora tool of the character. described, whereby theoperations may be accomplished Iwith greater ease :and -with lessexpenditure of time' and labor.

The invention will 4now be fully described with reference to theaccompanying drawings, in which Figure 1 is a view in elevation of thevalve spring lifter in operative position,

Figure 2 is a View in elevation of the same in contracted position,

Figure 3 is a view of the device in longitudinal section taken on line 38 of Figure 1, and

Figure 4; is another view in longitudinal section taken on line 4 4 ofFigure 2.

The valve spring lifter herein described comprises in general twoparallel arms 1 1 provided at corresponding ends with forked springengaging members 2 2, the arms being connected together and moved towardand from each` other by means of a linkage 3 embodying the principle ofthe so-called lazy tongs, the latter being flexed in opposite directionsand held in all positions of flexing by means of a screw shaft lconnected with the linkage in a manner hereinafter to be described indetail.

Each of the arms 1 preferably consists of two bars 5 5 spaced apartlaterally and pinned or riveted together at several points thruout theirlength by pins 6, one of which serves also as a journal pin for thellinka ;e 3, as will hereinafter be described. The "forked end portions2 2 are preferably separate parts secured between the forward endportions of the bars 5 5 of each arm 1, `the same being oifsetinwardlyasat 7 for this purpose. If desired, the forked members may be removablysecured `to the arms, thus permitting the use of `interchangeablemembers of different sizes for operation on various sizes of valvesprings.

As clearlyshown in Figs. 1 and 2, the ends of the arms carrying theforked portions 2 2 are ofi-set inwardly and toward each other, lso thatsaid forked portions may be brought 4closer together when the tool ,isin contracted position, as shown in Fig. `2. rihis enables t-he tool `tobe inserted 'beneath the spring and in position for lifting the same. j

The linkage 3 comprises two pairs of links 8 8 and`9--9, each pair beingpivotally connected ytogether midway of their yends at 8a and 9arespectively, and the Aadjacent ends of the links of bot-h pairs Vbeinglikewise connected together by means of journal pins forming integralextremities of rcylindric blocks 10 and 11'respectivel-y locatedat the'points of connection between the pai-rs `of links. Hthin these blocks10 and 11 is mounted the screw shaft 4f, the same being journalled atits forward end in the block 10, which forms a bearing for the endthereof. A nut 4S* is applied to the outer end of the shaft t beyond theblock 10, and a collar 12 is pinned to the shaft on the opposite side ofsaid block. Beyond the collar 12 the shaft is threaded thrnoutsubstantially onehalf the length thereof, saidthreaded portion engagingthe rear block 11. At the free end of the screw shaft is mounted ahandle 13.

The pairs of links 8 8 and 9 9 are connected at their free ends with thearms 1 1, two links of each pair being pivot-ally connected adjacent theforward ends of said arms by means of journal pins 14 14:, whereas theends of the other links of each pair have slidable connection with therear end portions of said arms thru the medium of pins 1.5 15 carried bythe links, and engaging longitudinal slots 1(5 16 formed in said arms.

From the construction as thus described, the mode of operation ofthedevice is readily apparent to those skilled in the art. if, as

shown in F ig. 1, it is desired to lift the valve spring 17 of the valveof a motor consisting in part of a valve stem 18 having a transverse pin19 therethru, against which the lower end of the spring normally bearsthru the medium of a collar 20, the tool in contracted position isinserted beneath the spring so that one of the forked ends bearsupwardly against the collar 2O and the other against a convenientbearing surface at the base of the valve stem. By rotating the screwshaft et by means of the handle 13 in a direction to flex the links, thearms would he forced apart, altho maintaining parallel relation to eachother. The flexing of the links is manifestly accomplished by forcingthe two journal blocks 10 and 11 toward or from each other, or rather,the block 11 engaging the threaded portion of the shaft toward and fromthe block 10, the latter being non-movable lengthwise with respect tosaid shaft. The arrangement of the pairs of links 8 8 and 9 9 is suchthat the same movement is transmitted to the pins 15 and 1G connectingthe outer ends of the links with the arms 1 1, the result being aparallel relative movement of said arms. By reason of the location ofthe screw shaft midway between the arms 1 1 and the nature of thetransmission of power to the links, the force is transmitted equally toboth arms, moving the same outwardly at the same speed and at the samedistance from the axis of the screw shaft. In this manner an equaldistribution of the stress thruout the entire structure is obtained, amore balanced action, and a uniform division of the wear to which theparts are subjected.

of parallel arms provided with spring en- ,V

gaging members at one end thereof, an extensible linkage comprisingpairs of links each pivotally connected together midway of their ends,and with each other at their adjacent ends, and having pivotal andendwise sliding connection with said arms, and a screw shaft j ournalledat one point of connection between said pair of links and havingthreaded engagement at the other point of connection.

2. A valve spring lifter, comprising arms provided at adjacent ends withforked spring engaging members, a parallel movement linkage between saidarms, and consisting of pairs of links of equal length, each pair beingpivotally connected at midpoints and with each other at their inner'ends and with the arms at their outer ends, through the medium of fixedpivotal and sliding pin and slot connections, and a screw shaftjournalled at one point of pivotal connection between said pairs oflinks and screw-threaded connection at the other point of pivotalconnection between said pairs of links.

In witness whereof, I hereunto subscribe my name this 8th day of June,A. D., 1921.

ANDREW A. KERGH.

